LeChatelier's Principle - Volume

Decrease Volume of gaseous system at equilibrium,
pressure increases.

System shifts to reduce pressure.
Reacts to decrease total molecules of gas


N2O4(g)  <==>  2 NO2(g)

Decrease Volume, pressure increases, K unchanged:
Δngas > 0
Δngas < 0
Δngas = 0
No effect

Add Inert gas, pressure increases: No effect